Bucket for elastic-fluid turbines.



W. FRITZ. BUCKET-FOB ELASTIC FLUID TURBINES.

APPLICATION TILED MAR.31,1911.

Patented June 6, 1911.

uJ Z Pt m Ofl w n P a iljfififiwx s 7 T Q e .5 H. I i H QJW .To 2 W 3 ll 2 a o .0 n m a N T STATE s PATENT OFFICE.

WALTER FRITZ. 0F BERLIN, GERMANY, ASSIGNOR TO GENERAL ELECTRIC COMPANY,

. A CORPORATION OF NEW YORK.

BUCKET FOR ELASTIC'FLUID TURBINES.

To all whom it may concern.

Be it known that I, \Vanrnn FRITZ. a subject of the German Emperor, residing at Berlin, Germany, have invented certain hew and useful lni 'irovements in Buckets tor Elastic-Fluid 'lurbines, of which the follow ing is a specification.

This invention relates to buckets for elastic-fluid turbines and the object oi the invention is the provision of an improved bucket structure that is simplepaets in an elllcient manner on the motive fluid, prevents loss of energy by eddy-currents.or leakage past the buckets, is securely attaehedlo the turbine members. and can be economically manufactured.

In the accompanving drawing illustrating an embodiment of my invention. Figurev 1 shows an assembled group of buckets; Fig. 2 is an end view of the buckets of Fig. 1; Fig. 3 is a top view of the group of buckets; Fig. a is a front view of the filling piece for closing the inner end of the bucket space; Fig. 5 is a side view of the filling piece; and Fig. (i is a top view of the tilting piece.

Referring to the drawing, 7 designates any typical turbine bucket-earrying member. The surfaces of the buckets or vanes S are curved in a well-known manner. The bucle ets illustrated are of uniform thickness but the form of the bucket ci.'osssection can be varied from'thatshown. The bases or inner ends of the buckets are provided. with integral ears 9 that engage'the parallel outer faces of the rim or edge of the member 7, the metal of the buckets being curved inwardly and downwardly ,from the active portion of said buckets to the ear In order to confine the motive fluid to the active portionof the buckets where it performs useful work and to prevent leakage and eddy-currents and the consequent loss of energy, tilling pieces 10 are arranged between the inner endsof the'buckets. The outer or upper .faces of the filling pieces are substantially perpendicular to the elements of the bucket "surfaces. Said faces are also located beyond the periphery of the member? at a point where the active surface ofthe buckets ter- 'minates and the bodies of the buckets begin to curve downwardly and inwardly to the ears 9. The outer ends of the buckets can be provided with a suitable shroud or cover if desired.

Specification of Letters Patent.

Application filed March 31, 1911.

"a'tented June (5, 1911.

Serial No. 618.107.

In the structure dwcribcd. the tlow of motive fluid through the bucket space is contined to a region between accurately shaped surfaces ih-i. 5ued to secure ellieient. operation. The front lane of the head of the filling piece i shaped to tit clo el against the next bucket. The width ot the head isihe same as the width ot' the bucket. The filling piece is provided with a tongue or projectio-n ii. that engages a groove or slot l2 in the edge ot the member T having straight parallel walls. while the shoulders 13 engage th periphery ot said member at each side of the groove. Rivets 14- pass through the upper portions of cars i the tongues ll and the rim oi the member T to secure the bases of: the buckets to said member. ()Iher rivets 15 passing through the lower portion ol' the ears and the rim 'lurth r secure the buckets to the member T.

The buckets and tilting pieces. together with their securing means. are relatively simple and compact in structure. e onomically manufactured and a sembled. an are ellicient in performing their 'l'unction-r.

In accordance with the provisions of the patent statutes, l have described the principle of operation of my invention. together with the apparatus which I now con ider to represent the best emlmdimeut thereof: but I desire to have it understood that the apparatus shown is only illustrative. and that the invention can be carried out by oth r means.

hat I claim as new and desire to sccillc by Letters Patent of the United States. I 1. The coml'iination ot a liucket-earrving member having a groove in its periphery. buckets having their innerends mounted on the member outside of the grom'c. and tilling pieces between said ends that are provided with tongues that enter the grmwe.

The combination of a lmcket-carrving member having a groove in its periphery whose side walls are/plane urfaces. buckets mounted on said member. and titling pieces between the inner ends of the buckets that are provided with tongues-that tit into said groove.

3. The combination of a lnn'kt'l-(:Ill}lli!i member having a groove in its pcriphci v provided with straight parallel side walh. bucket. mounted on said member, and 1mm;

back ol the adjoining bucki-t and the back. iaee is similarly fitted to the iron! i the iii a is

E li

pieces that close the inner ends of the bucket spaces and are provided with tongues that fit into the groove.

4. The combination of a bucket-carrying member having a. straight-walled. groove in its periphery, buckets on said men'iber having active surfaces and bases into which said surfaces merge and filling pieces between the bases that close the bucket spaces at the inner ends of said surfaces and are provided with tongues that enter the groove.

5; The combination of a bucket-carrying member having a groove in its periphery,

buckets having-bases provided with ears that engage opposite sides of the member,

and filling pieces having heads that engage the adjoining faces of ad aCent bases above said ears and tongues that enter the groove.

6. The combination of abucket-carrying member havlng a groove in 1ts per phery,

buckets, having bases mounted on the mem ber, filling pieces between the bases that close the inner ends of the bucket spaces, said filling pieces having tongues that fit into the groove and shoulders that engage vthe edge of the member at each side of said groove, and means for securing the bases and filling pieces to said member.

7. The combination of a bucket-carrying member having a slot or groove in its periphery, buckets havmg ears projecting from their bases and engagingJ opposi-te,

faces of said member, filling pieces between the bases that close the inner end of the bucket spaces, said filling pieces having tongues that enter the groove and shoulders groove in its periphery whose sidewalls are parallel to said faces, buckets having bases that engage said faces, filling piecesbetween said bases that close the inner ends of the. bucket spaces and are provided with tongues that fit into thegroove, and means for securing the buckets and filling-pieces to said 'member.; I

.In witness whereor, I havelnereunto set my hand this llth'day of March, 1911;-

WALTER FRITZ."

VVit-nesses Z VVOLDEMAR HAUPT, Y HENRY HASPER. 

